"Dave.C" wrote in message
k...
Out of interest, I noticed there are 14 separate centres of LP on the UKMO
12z fax chart for this Sunday 19th Dec.
Is that unusual or haven't I counted before?

I wouldn't say it's particularly unusual but it's certainly quite busy.

Also, is it of any particular significance?

I wouldn't say so. The whole process is quite subjective, e.g. on some
charts the base of a well defined surface trough will be marked with a low
and others won't. The 12Z T+72 is a fairly good example of this, there's
numerous troughs which another forecaster may have marked with a low :
http://imkpc3.physik.uni-karlsruhe.de/pics/brack2.gif
e.g the troughing to the east of Scotland or to the west of Iceland, you can
quickly bring up the count if you're keen :-)

Jon.